<!DOCTYPE html>
<html>
	<head>
		<meta charset="UTF-8">
		<title></title>
		
		
		<style>
			
			div{
				
				width: 350px;
				
				height: 120px;
			}
			
			#aa{
				background-color: red;
				
			}
			#bb{
				background-color: green;
				
				/*display: none;*/
				
				visibility: hidden;
				
			}
			#cc{
				background-color: blue;
			}
			#dd{
				background-color: yellow;
			}
		</style>
	</head>
	<body>
		
		
		<div id="aa">11</div>
		<div id="bb">22</div>
		<div id="cc">33</div>
		<div id="dd">44</div>
	</body>
</html>
